Journal ArticleDOI
Geopolymer technology: the current state of the art
Peter Duxson,Ana Fernández-Jiménez,John L. Provis,Grant C. Lukey,Ángel Palomo,J.S.J. van Deventer +5 more
TLDR
A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali activation of aluminosilicates as mentioned in this paper.Abstract:
A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali-activation of aluminosilicates. The fundamental chemical and structural characteristics of geopolymers derived from metakaolin, fly ash and slag are explored in terms of the effects of raw material selection on the properties of geopolymer composites. It is shown that the raw materials and processing conditions are critical in determining the setting behavior, workability and chemical and physical properties of geopolymeric products. The structural and chemical characteristics that are common to all geopolymeric materials are presented, as well as those that are determined by the specific interactions occurring in different systems, providing the ability for tailored design of geopolymers to specific applications in terms of both technical and commercial requirements.read more
Citations
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Journal ArticleDOI
The Role of Inorganic Polymer Technology in the Development of ‘Green Concrete’
TL;DR: In this paper, the potential position of and drivers for inorganic polymers (“geopolymers”) as an element of the push for a sustainable concrete industry are discussed.
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Carbon dioxide equivalent (CO2-e) emissions: A comparison between geopolymer and OPC cement concrete
TL;DR: In this article, the authors present the results of comprehensive carbon footprint estimates for both geopolymer and OPC concrete, including energy expending activities associated with mining and transport of raw materials, manufacturing and concrete construction.
Journal ArticleDOI
Advances in alternative cementitious binders
TL;DR: In this paper, four promising alternative binders available as alternatives to Portland cement are discussed, namely calcium aluminate cement, calcium sulfoaluminate cements, alkali-activated binders, and supersulfated cements.
Journal ArticleDOI
New cements for the 21st century: The pursuit of an alternative to Portland cement
TL;DR: Aluminosilicate-based alkaline cements have been classified into five categories as discussed by the authors, and the key advances made in the understanding of synthetic gels are discussed, which ultimately finds hybrid cements to be technologically viable materials for contemporary construction.
Journal ArticleDOI
Geopolymer concrete: A review of some recent developments
TL;DR: An overview of advances in geopolymers formed by the alkaline activation of aluminosilicates is presented along with opportunities for their use in building construction as mentioned in this paper, with respect to fresh and hardened states, interfacial transition zone between aggregate and geopolymer, bond with steel reinforcing bars and resistance to elevated temperature.
References
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Journal ArticleDOI
29Si NMR study of structural ordering in aluminosilicate geopolymer gels.
TL;DR: The short-range ordering observed here indicates that Loewenstein's Rule of perfect aluminum avoidance may not apply strictly to geopolymeric gels, although further analyses are required to quantify the degree of aluminum avoidance.
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Effect of Curing Temperature and Silicate Concentration on Fly-Ash-Based Geopolymerization
TL;DR: In this paper, the pore structure of fly-ash-based geopolymers was studied using electron microscopy and porosimetry, showing that higher curing temperature increases the extent and rate of reaction, shown through an increase in mesopore volume, surface area, and an accelerated setting time.
Journal ArticleDOI
Role of surface speciation in the low-temperature dissolution of minerals
Alex E. Blum,Antonio C. Lasaga +1 more
TL;DR: In this paper, surface species control the mechanism and rate of low-temperature silicate dissolution and precipitation reactions in dilute solutions, and the authors report a comparison of surface species concentrations with the dissolution rates of olivine and albite which indicates that dissolution rates have a simple firstorder dependence on surface concentrations of specific surface species.
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Structural reorganisation of class F fly ash in alkaline silicate solutions
W.K.W. Lee,J.S.J. van Deventer +1 more
TL;DR: In this paper, a fly ash was leached in alkaline solutions (pH∼13.95) of varying concentrations of soluble silicates at 20°C, and the elemental compositions of the leached solutions were studied by inductively coupled plasma with optical emission spectroscopy (ICP-OES).
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Microanalysis of calcium silicate hydrate gel formed within a geopolymeric binder
TL;DR: In this article, it is shown that the properties (e.g., size, elemental composition) of the geopolymeric and CSH gels forming simultaneously, and the reactivity of the calcium precipitates along the interfacial region, will hold the key in reformulating a new generation of concrete that matches the durability of ancient concrete.